Regulators unveiled the plan Wednesday at a meeting with industry representatives and scientists on refining Colorado's rules on testing and labeling foods and drinks infused with pot. The work group was assembled in April to address complaints that consumers are confused by pot-infused treats such as candies and cookies.

State regulators proposed quarterly testing for products with less than 10 milligrams of marijuana's psychoactive chemical.

An industry representative estimated that 8 million to 12 million servings of edible marijuana have been sold in Colorado since January. But the popularity of marijuana-infused cookies and sodas has raised concerns about overconsumption and accidental ingestion by kids.